I just checked the latest Natty 11.04 daily: both Alt+PrtScn and Alt+PrtScn+REISUB work again as expected.
@Fibonacci: I don't have a separate SysReq key. If it still does nothing in Natty and you want to change that, I'd propose to open a new bug report, as this one is about the broken Alt+PrtScn in Maverick.
I just checked the latest Natty 11.04 daily: both Alt+PrtScn and Alt+PrtScn+REISUB work again as expected.
@Fibonacci: I don't have a separate SysReq key. If it still does nothing in Natty and you want to change that, I'd propose to open a new bug report, as this one is about the broken Alt+PrtScn in Maverick.